package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import com.sun.org.apache.bcel.internal.generic.LADD;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * @Author: King-lby
 * @Date Created in 2022-11-11 19:50
 */

/**
 * 购物车
 */
@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;


    /**
     * 添加购物车数据
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("shoppingCart:{}",shoppingCart);
        //设置用户id，指定当前哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        Long dishId = shoppingCart.getDishId();
        Long setmealId = shoppingCart.getSetmealId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        if (dishId != null){
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            queryWrapper.eq(ShoppingCart::getSetmealId,setmealId);
        }
        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);
        if (cartServiceOne != null){
            //如果存在，就number + 1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else{
            //不存在，就添加到购物车中，默认number = 1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 减少购物车数据
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车中有什么：{}",shoppingCart);
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        Long dishId = shoppingCart.getDishId();
        Long setmealId = shoppingCart.getSetmealId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);
        if (dishId != null){
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            queryWrapper.eq(ShoppingCart::getSetmealId,setmealId);
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null){
            Integer number = cartServiceOne.getNumber();
            if ( number <= 1){
                //如果=1 清空remove
                shoppingCart.setNumber(0);
                shoppingCartService.remove(queryWrapper);
//                shoppingCartService.save(shoppingCart);
                cartServiceOne = shoppingCart;
            }else{
                //如果购物车数量大于1，-1
                cartServiceOne.setNumber(number - 1);
                shoppingCartService.updateById(cartServiceOne);
                shoppingCart.setCreateTime(LocalDateTime.now());
            }
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车");
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(queryWrapper);
        return R.success("清空购物车成功");
    }
 }
